mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-11 09:50:12 +00:00
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/* Language-level data type conversion for GNU C.
|
||
Copyright (C) 1987, 1988, 1991, 1998 Free Software Foundation, Inc.
|
||
|
||
This file is part of GNU CC.
|
||
|
||
GNU CC is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
GNU CC is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GNU CC; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
|
||
/* This file contains the functions for converting C expressions
|
||
to different data types. The only entry point is `convert'.
|
||
Every language front end must have a `convert' function
|
||
but what kind of conversions it does will depend on the language. */
|
||
|
||
#include "config.h"
|
||
#include "tree.h"
|
||
#include "flags.h"
|
||
#include "convert.h"
|
||
#include "toplev.h"
|
||
|
||
/* Change of width--truncation and extension of integers or reals--
|
||
is represented with NOP_EXPR. Proper functioning of many things
|
||
assumes that no other conversions can be NOP_EXPRs.
|
||
|
||
Conversion between integer and pointer is represented with CONVERT_EXPR.
|
||
Converting integer to real uses FLOAT_EXPR
|
||
and real to integer uses FIX_TRUNC_EXPR.
|
||
|
||
Here is a list of all the functions that assume that widening and
|
||
narrowing is always done with a NOP_EXPR:
|
||
In convert.c, convert_to_integer.
|
||
In c-typeck.c, build_binary_op (boolean ops), and truthvalue_conversion.
|
||
In expr.c: expand_expr, for operands of a MULT_EXPR.
|
||
In fold-const.c: fold.
|
||
In tree.c: get_narrower and get_unwidened. */
|
||
|
||
/* Subroutines of `convert'. */
|
||
|
||
|
||
|
||
/* Create an expression whose value is that of EXPR,
|
||
converted to type TYPE. The TREE_TYPE of the value
|
||
is always TYPE. This function implements all reasonable
|
||
conversions; callers should filter out those that are
|
||
not permitted by the language being compiled. */
|
||
|
||
tree
|
||
convert (type, expr)
|
||
tree type, expr;
|
||
{
|
||
register tree e = expr;
|
||
register enum tree_code code = TREE_CODE (type);
|
||
|
||
if (type == TREE_TYPE (expr)
|
||
|| TREE_CODE (expr) == ERROR_MARK)
|
||
return expr;
|
||
if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
|
||
return fold (build1 (NOP_EXPR, type, expr));
|
||
if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
|
||
return error_mark_node;
|
||
if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
|
||
{
|
||
error ("void value not ignored as it ought to be");
|
||
return error_mark_node;
|
||
}
|
||
if (code == VOID_TYPE)
|
||
return build1 (CONVERT_EXPR, type, e);
|
||
#if 0
|
||
/* This is incorrect. A truncation can't be stripped this way.
|
||
Extensions will be stripped by the use of get_unwidened. */
|
||
if (TREE_CODE (expr) == NOP_EXPR)
|
||
return convert (type, TREE_OPERAND (expr, 0));
|
||
#endif
|
||
if (code == INTEGER_TYPE || code == ENUMERAL_TYPE)
|
||
return fold (convert_to_integer (type, e));
|
||
if (code == POINTER_TYPE)
|
||
return fold (convert_to_pointer (type, e));
|
||
if (code == REAL_TYPE)
|
||
return fold (convert_to_real (type, e));
|
||
if (code == COMPLEX_TYPE)
|
||
return fold (convert_to_complex (type, e));
|
||
|
||
error ("conversion to non-scalar type requested");
|
||
return error_mark_node;
|
||
}
|